Besides being four letters long (and ending in the same three letters) what specific and unusual property do these three words share?

BOWS, ROWS, SOWS

Here is the SOLUTION.

SOLUTION:

They're heteronyms. Each word has multiple meanings, depending on the pronunciation used.

"Bows" can be a verb ("inclines") or a noun ("arrow shooters").

"Rows" can be a verb ("participates in a fight") or a noun ("lined-up groups").

"Sows" can be a verb ("plants seeds") or a noun ("adult female pigs").

NOTE: These three words each have additional meanings, as well.